Analytical Industries GPR-1600 MS Series PPB Oxygen Analyzer - Manual (Page 33)

Advanced Instruments Inc.
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9. Press the ENTER key to advance the underline cursor right or press the MENU key to advance the underline cursor left to
reach to the desired digit of the OUTPUT ZERO OFFSET value.
10. Press the ARROW keys to enter the OUTPUT ZERO OFFSET value.
11. Repeat steps 9 and 10 until the complete OUTPUT ZERO OFFSET value has been entered.
12. Save the adjustment value by pressing the ENTER key or abort by pressing the MENU key.
13. The system returns to the SAMPLING mode.
Span Calibration
Span Calibration involves adjusting the transmitter electronics to the sensor’s signal output at a given oxygen standard.
Maximum drift from calibration temperature is approximately 0.11% of reading per °C. The frequency of calibration varies with
the application conditions, the degree of accuracy required by the application and the quality requirements of the user.
However, the interval between span calibrations should not exceed three (3) months.
Note: Regardless of the oxygen concentration of the standard used, the span calibration process takes approximately 10
minutes, however, the time required to bring a ppm analyzer back on-line can vary depending on a combination of factors and
assumes exposure to a zero/purge/sample gas** with an oxygen content below the stated thresholds immediately after span
calibration:
* Refer to analyzer specifications for comparable data on the Pico-Ion UHP and MS oxygen sensors.
Recommendations General:
¾ The interval between SPAN CALIBRATION should not exceed three (3) months.
¾ Always calibrate at the same temperature and pressure of the sample gas stream.
¾ If a ZERO CALIBRATION adjustment is made during initial installation, it is normally not required again until the sample
system connections are modified or a new oxygen sensor is installed. Therefore the DEFAULT ZERO function is
recommended only when performing a ZERO CALIBRATION and during troubleshooting and should not be repeated before